To provide a pipe expansion device of a heat exchanger wherein no buckling of fin collars is generated, and the heat exchanger is constituted of radiating fins with a constant distance.
The pipe expansion device is provided with: mandrels 8 having billets 5 at their respective tips; a reciprocating body 9 supporting the back ends of the mandrels 8 and being supported to be freely reciprocated in an axial direction of hair pin pipe linear parts 7a; a pressurizing cylinder 10 which elevates the reciprocating body 9, and pipe-expands, as a pressurizing driving source, the linear parts 7a in such a manner that the billets 5 are pressed into the hair pin pipe linear parts 7a; hair pin receivers 2 supporting curved parts 7b of the hair pin pipes 7; a fin receiver 1 supporting the bottom part of the radiating fins 6a superimposed with several sheets; and a hydraulic cylinder 3 as a means for elevating the fin receiver 1. The cylinder 3 sends down the fin receiver 1 to a prescribed position when the mandrels 8 descend, and the billets 5 start getting into the hair pin pipes 7.
| JPS6219691 | NONSHRINKABLE EXPANSIBLE CONDUIT FOR HEAT EXCHANGER OR SIMILAR ARTICLE |
| JP4537019 | Brazing method of aluminum material |
| JP2019531451 | Oil heater |
NAKAJIMA SHINJI
TANAKA MITSURU
TAKADA HIROAKI
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order